The Navy needs to invest heavily in unmanned ships to improve its intelligence, surveillance and reconnaissance functions, according to Chief of Naval Operations Adm. Michael Gilday. Unmanned ships will be a crucial part of the Navy's future, Gilday said at Defense One's State of the Navy event today. Earlier this month, Defense Secretary Mark Esper laid out " Battle Force 2045 ," a plan for the Navy to grow to over 500 manned and unmanned ships to counter China...